=over

=item readlink EXPR
X<readlink>

=item readlink

Returns the value of a symbolic link, if symbolic links are
implemented.  If not, raises an exception.  If there is a system
error, returns the undefined value and sets L<C<$!>|perlvar/$!> (errno).
If EXPR is omitted, uses L<C<$_>|perlvar/$_>.

Portability issues: L<perlport/readlink>.

=back